Yamaha T135SE Service Manual page 335

6. Thermo sensor
9Remove the thermo sensor from the cylinder.
9Connect the digital circuit tester (Ω × 100) to
the thermo switch 1 as shown.
9Immerse the thermo sensor in a container
filled with coolant 2.
NOTE:
Make sure that the thermo sensor terminals
do not get wet.
9Place a thermometer 3 in the coolant.
9Slowly heat the coolant, then let it cool to the
specified temperature as indicated in the
table.
9Check the thermo sensor for continuity at the
temperatures indicated in the table.
Thermo sensor resistance
2.32–2.59 kΩ at 20°C (68°F)
310–326 Ω at 80°C (176°F)
140–144 Ω at 110°C (230°F)
w
9 9 Handle the thermo sensor with special
care.
9 9 Never subject the thermo sensor to
strong shocks. If the thermo sensor is
dropped, replace it.
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Yamaha T135 Service Manual
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COOLING SYSTEM
3
9Does the thermo sensor operate properly as
described above?
YES
Tighten the thermo
sensor to specified
torque.
18 Nm
(1.8 m•kg, 13 ft•lb)
EAS00795
7. Wiring
9Check the entire signaling system wiring.
Refer to "CIRCUIT DIAGRAM".
9Is the signaling system wiring properly con-
nected and without defects?
YES
Check the condi-
tion of each of the
cooling system cir-
cuits.
Refer to "CHECK-
ING THE COOL-
ING SYSTEM".
ELEC
1
2
NO
Replace the
thermo sensor.
NO
Properly connect or
repair the cooling
system wiring.